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| author | Josef Bacik <josef@redhat.com> | 2011-03-24 13:54:24 +0000 |
|---|---|---|
| committer | Alasdair G Kergon <agk@redhat.com> | 2011-03-24 13:54:24 +0000 |
| commit | 3407ef5262b55ca5d7139d2b555ef792fe531eec (patch) | |
| tree | fb5e083851c636e515095bb3eb90325f4b175129 /Documentation/device-mapper | |
| parent | 024d37e95ec4a7ccc256973ab2feab01f4fbdd2d (diff) | |
| download | linux-3407ef5262b55ca5d7139d2b555ef792fe531eec.tar.gz linux-3407ef5262b55ca5d7139d2b555ef792fe531eec.tar.bz2 linux-3407ef5262b55ca5d7139d2b555ef792fe531eec.zip | |
dm: add flakey target
This target is the same as the linear target except that it returns I/O
errors periodically. It's been found useful in simulating failing
devices for testing purposes.
I needed a dm target to do some failure testing on btrfs's raid code, and
Mike pointed me at this.
Signed-off-by: Josef Bacik <josef@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'Documentation/device-mapper')
| -rw-r--r-- | Documentation/device-mapper/dm-flakey.txt | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/Documentation/device-mapper/dm-flakey.txt b/Documentation/device-mapper/dm-flakey.txt new file mode 100644 index 000000000000..c8efdfd19a65 --- /dev/null +++ b/Documentation/device-mapper/dm-flakey.txt @@ -0,0 +1,17 @@ +dm-flakey +========= + +This target is the same as the linear target except that it returns I/O +errors periodically. It's been found useful in simulating failing +devices for testing purposes. + +Starting from the time the table is loaded, the device is available for +<up interval> seconds, then returns errors for <down interval> seconds, +and then this cycle repeats. + +Parameters: <dev path> <offset> <up interval> <down interval> + <dev path>: Full pathname to the underlying block-device, or a + "major:minor" device-number. + <offset>: Starting sector within the device. + <up interval>: Number of seconds device is available. + <down interval>: Number of seconds device returns errors. |